Valve



March 5, 1946. T. F. SAEFADY VALVE Filed Sept. 10, 1945 v v INVENTOR; @O/WQS kj a j ady E L. Dd 21/15 ATTO E NEY Patented Mar. 5, 1946 i; 1:.

. VALVE Thomas F. Saflady, Detroit, Mich. I Application September 10,1945, Serial No. 615,342 3 Claims. (01. 123-177 The object of my invention is to provide a more efficient valve of the liquid cooled type.

Still a further object of my inventionis to provide a, liquid cooled valve wherein there is means for insuring complete wetting of the interior of the valve head, especially adjacent to the valve seat portion thereof.

Still a further object of my invention is to provide a hollow valve which is partly full of liquid coolant which has a hollow stem'and a hollow tulip shaped head and to provide in connection with the head and stem a member which tends to deflect the coolant toward the periphery of the head and which also acts to increase the normal speed of the coolant so projected to increase the eficiency of the cooling fluid.

With these and other objects in view, my invention consists of the construction claimed in the claims, described in the specification and shown in the accompanying drawing, in whichi Figure 1 shows a side elevation of the improved valve, parts being broken away to better illustrate the construction.

Figure 2 shows a top or plan view of the valve.

Figure 3 shows a horizontal section on the line 33 of Figure 1.

Referring to the accompanying drawing, a hollow stem II] has a hardened tip II, which is designed to cooperate with a cam or tappetnot shown. At the opposite end of the stem a tulip I2 is formed in any suitable manner but preferably by preforming and then welding it to the stem. A cap or head member I3 is secured to the valve and then the other end. As this reciprocation is veryrapid, the sodium must circulate very rapidly and contact the entire surface on the inside of the valve with each reciprocation. As the valve reaches the top limit of its movement, the sodium goes to the bottom of the valve. When the valve returns to its normal position the sodium is forced up to the top of the valve. As the valve is only partially filled with the liquid there is some tendency for the sodium to form vapor locks due to the extremely high speed ofthe reciprocation. It was heretofore proposed to contact the top of the valve stem to reduce its diameter and thereby secure this Venturi efiect. If the stem material is merely beaded inwardly, then the ultimate strength of the stem is lessened. If the stem is thickened to form this venturi, then either expensive machining operations or expensive forming operations are necessary. With my improved structure the member I6 may be very simply and inexpensively forged and then welded into place before the head is welded'to the valve V or, of course, the-entire headl3 and member I5 tulip l2, preferably by providing the locating q the proper positioning of the head [3 and a clean surface on the inside and outside thereof.

A member I6 is either formed integrally with or welded to the inside of the head l3 at the center thereof. This weld is indicated by the dotted line I9. The base portion of the member l6 is flared outwardly as shown at H and the contracted tip portion [8 thereofv extends a substantial distance into the top of the stem ID. The efiect of this member i5 is first to cause a Venturi action of the liquid which is forced past the tip l8. It will be understood that these valves are normally charged with metallic sodium in an amount about per cent of the total space'inside the valves. When the engine is at. rest, the sodium solidifies, but when the engine is working, the valve temperature raises sufficiently to liquefy the metallic sodium so that as the valve reciprocates rapidly during the operation of the engine the sodium is first forced toward one end of the vMl ' maybe forged in one piece. I have found that if the tip I8 is made .to have a crosssection of approximately one. quarter that of the stem interior, that the most efficient results are secured. 1 My improved structure has the further advantage v of having the flared base H which directs the fluid accelerated by the venturi formed by the tip l8 directly toward the periphery of the interior of the head of-the valve. Naturally this is part of the valve which is the most critical to cool.

Some changes may be made in' the arrangement and construction of my improved valve, and it ismy intention to cover by my claims such changes as may reasonably be included within the scope thereof.

I claim as my invention; 1. In a tulip shape valve for internal combustion engines, a hollow stem sealed at one end, a

hollow tulip head connected to the other end of the stem, the stem being partly filledwith a cooling substance,'a' cap closing theopen end of the tulip, said cap, being welded to the tulip, and t a combined deflector and'Venturi member extended downwardly fromthe cap. to form with the stem a Venturi restriction and to'deflect the cooling substance as it enters the head toward the .7

the stem, the stem being partly filledwith' a cooling substance, a cap closing the openend ofthe tulip head, the cap and tulip having interengaging surfaces to positively determine the positicn of the cap relative to the tulip and the parts being welded together, and a combined defiector and Venturi member extended downwardly from the cap to form with the stem a Venturl restriction and to deflect the cooling substance as it'enters the head toward the periphery of the tulip.

3. In a tulip shape valve forintemalcombus- 

